Hinge for watch-cases



(No Model.) 2 Sheets-Sheet 1.

D. OHARA.

HINGE FOR WATGHOASES. v

Patented Aug. 19, 1884. o

AM!!! I B (No Model.) 2 sheetssheet 2;

13.0mm. HINGE FOR WATCH GASES.

No. 303,881. Patented Aug. 19, 1884.

N. rzrens. PhclwLimographur, washmglom of c.

UNITED STATES ATENT Fries.

DANIEL OHARA, OF WVALTHAM, MASSACHUSETTS.

SPECIFICATION forming part of Letters Patent No. 303,881, dated August19, 1884.

Application filed March 7, 1884.

To aZZ whom, it may concern/.-

Be itknown that I, DANIEL OHARA, of the town of WValtham, Middlesexcounty, Massachusetts, have invented a new and useful Improvement inHinges for WVatch-Oases, &c., of which the following is a specification.

My invention, while applicable to a variety of sheet-metal cases andvessels, is particularly designed as a mode of articulating the outercaps, backs, or bczels of watchcases to their bod y-centers, by whichthe cusioinary transverse joints of the hinge areco1npletely concealedor hidden from view, so as to combine the advantages of excluding dust,moisture, &c., and of securing greater elegance and neatness of externalfinish.

In the accompanying drawings, Figure 1 is a partly-sectioned inside viewof a watclr case cap or back and corresponding bodycenter embodying myinvention. Fig. 2 shows partly in section an unfinished hinge part ofsuch cap or back, together with one of the two included bushes and thecoupling pin or pintle inposition. Fig. 3 shows the two members of myhinge in transverse section. Fig. 4 shows my finished hinge partly inrelief and partly in longitudinal section. Fig. 5 is an edge View of anopen-face watclrcase embodying my invention. Figs. 6 and 7 represent byvertical transverse and horizontal axial sections such a hinge appliedto a sheetmetal tea-pot.

A may represent the body-center watch-case, B an external cap or back, 0a bezel. Projecting from and preferably constituting an integral part ofthe body-center in the represented tangential position, is a cylindricalhinge-knuckle, D. That part of the bodycenter at each end of saidknuckle has semi-cylindrical channels E coaxial with said knuckle.Projecting in the represented taugential position from and preferablyconstituting an integral part of the back or bezel, is a cylindricalsheath, F, whoseinterior bore corresponds in diameter, and when in placein the watch-case is coaxial with the bodycenter knuckle D, and whoseexterior corresponds with the channels E. The inner half of any 01" thiscylindrical sh eath is, where it comes opposite the body-center knuckleD,cut away, as shown at 7. Driven tightly into each end of (No model.)

the sheath is a cylindrical tube or bushing, G, of identical diameterand bore with the bodyeenter knuckle D. The two members of the hinge arecoupled together by means of a pivot rod or pintle, H, which ispreferably of brass or steel. The bushings G may be of brass. The abovehinge members being thus secured in position the sheath ends are, by aburnishing-tool or other means, neatly closed, as shown in Fig. 5, andon the right-hand side of Fig. 4, so as to couple the back, cap, orbezel to the body-center by concealed, secret, orinvisible knuckle andbushings, which, besides presenting a notably neat and elegant finish,is practically dust proof. A substantially similar hinge is availablefor uniting to their bodies the lids of silver tea-pots and othersheet-metal vessels. Such application of my hinge is shown in Figs. 6and 7, and in such applications the lid-rim may be of sufficientdiameter to completely include the sheath within its periphery, as shownin said figures.

The above-described preferred form of my invention may be multiplied innon-essential particulars. For example, the sheath projection from thecap, back, or bezel may inclose a single knuckle, which may be interposed between two knuckle projections from the body-center.

I claim as new and of my invention 1. Asheath, F, in combination with'ahinge knuckle, to conceal thetransverse joints, as set forth.

2. The sheath F, constituting an integral projection from the cap, back,or bezel of a watch-case and concealing the joints, substantially as setforth.

3. The hinge-conneetion of a watch-case cap, back, or bezel with thebody-center, consisting of hinge-knuckle D, constituting an integralprojection from the body-center, cylindrical sheath F constitutin aninte ral )roj ection from the cap, back, or bezel, bushings G, and thepintle H, substantially as set forth. In testimony of which invention Ihereunlo set my hand.

DANIEL OHARA. Attest:

GEORGE E. VAN NORMAN, B. B. J oHNsoN.

